SynScan (for Sky-Watcher Star Adventurer GTi) app - how does the two star alignment filter available stars?

[pie_in_the_sky]

Hi all,

As the slightly verbose title suggests - a month or two ago I would perform two star alignment using Dubhe (near Polaris) and Rigel (near Orion neb). Now though, when I pick Dubhe I can't then select Rigel (or vice versa).

I'm assuming there is some ruleset in the app that determines what stars can be used, for example I notice you can't pick two stars in the same constellation. Does anyone know what the logic is used by the app to determine which stars are available for 2+ star alignment and/or why I was able to choose the stars mentioned and now can't?

Ta